VCP-DCV vSphere Performance and Scaling Practice Question
A VMware vSphere cluster uses vSphere Fault Tolerance (FT) for a critical virtual machine with 4 vCPUs. The administrator notices increased latency and CPU ready time on the primary VM. What is the most likely cause?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The VM has more than 2 vCPUs, increasing the overhead of deterministic replay.
VSphere FT for multi-vCPU VMs uses a deterministic record/replay mechanism that can introduce significant overhead, especially with 4 vCPUs. Option A is incorrect because jumbo frames do not cause FT overhead. Option B is incorrect because thin provisioning affects storage I/O, not CPU ready time. Option D is incorrect because FT does not use multicast; it uses a dedicated network for logging traffic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The network between the primary and secondary VM uses jumbo frames.
Why it's wrong here
Jumbo frames are not a main cause of FT overhead.
- ✗
The virtual disks are thinly provisioned, causing I/O latency.
Why it's wrong here
Thin provisioning affects storage I/O, not CPU ready time.
- ✓
The VM has more than 2 vCPUs, increasing the overhead of deterministic replay.
Why this is correct
vSphere FT for multi-vCPU VMs uses deterministic record/replay, which increases overhead with more than 2 vCPUs.
- ✗
The FT logging traffic is sent over multicast, causing packet loss.
Why it's wrong here
FT does not use multicast; it uses a dedicated network for logging traffic.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This VCP-DCV practice question is part of Courseiva's free VMware certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the VCP-DCV exam.